Observation of B⁰s→ K^∗±K^∓and evidence for B⁰s→ K^∗-π⁺decays

Measurements of the branching fractions of B ⁰ _s→ K ^∗±K ^∓and B ⁰ _sK ^∗±π ^∓decays are performed using a data sample corresponding to 1.0 fb ^-1of proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 7 TeV, where the K ^∗±mesons are reconstructed in the K ⁰ _sπ ^±final state. The first observation of the B ⁰ _s→ K ^∗±K ^∓decay and the first evidence for the B ⁰ _s→ K ^∗-π ⁺decay are reported with branching fractions (Equation presented), where the first uncertainties are statistical and the second are systematic. In addition, an upper limit of B(B ⁰→ K ^∗±K ^∓) < 0.4 (0.5) × 10 ^-6is set at 90% (95%) confidence level.